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    <title>clEnqueueAcquireD3D10ObjectsKHR</title>
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    <div class="refentry">
      <a id="id-1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clEnqueueAcquireD3D10ObjectsKHR"></a>
        <h1>clEnqueueAcquireD3D10ObjectsKHR</h1>
        <p>Acquire OpenCL memory objects that have been created from Direct3D 10 resources</p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                <a class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a>
                    <strong class="fsfunc">clEnqueueAcquireD3D10ObjectsKHR</strong>(</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_objects</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*mem_objects</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event_wait_list</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event</var><code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="parameters"></a>
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <code class="varname">command_queue</code>
              </span>
            </dt>
            <dd>
              <p>
                    A valid command-queue.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">num_objects</code>
              </span>
            </dt>
            <dd>
              <p>
                    The number of memory objects to be acquired in <code class="varname">mem_objects</code>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">mem_objects</code>
              </span>
            </dt>
            <dd>
              <p>
                     A pointer to a list of OpenCL memory objects that were created from Direct3D 10 resources.
                </p>
            </dd>
            <dt>
              <span class="term"><code class="varname">num_events_in_wait_list</code>, <code class="varname">event_wait_list</code></span>
            </dt>
            <dd>
              <p>
                  Specify events that need to complete before this particular
                  command can be executed.  If <code class="varname">event_wait_list</code>
                  is NULL, then this particular command does not wait on any
                  event to complete. If <code class="varname">event_wait_list</code> is
                  NULL, <code class="varname">num_events_in_wait_list</code> must be 0. If
                  <code class="varname">event_wait_list</code> is not NULL, the list of events
                  pointed to by <code class="varname">event_wait_list</code> must be valid and
                  <code class="varname">num_events_in_wait_list</code> must be greater than 0. The events
                  specified in <code class="varname">event_wait_list</code> act as synchronization points.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">event</code>
              </span>
            </dt>
            <dd>
              <p>
                  Returns n event object that identifies this particular command and
                  can be used to query or queue a wait for this particular command to
                  complete. <code class="varname">event</code> can be NULL in which case it will not be
                  possible for the application to query the status of this command or queue a
                  wait for this command to complete.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          The Direct3D 10 objects are acquired by the OpenCL context associated with
          <code class="varname">command-queue</code> and can therefore be used by all command-queues
          associated with the OpenCL context.
        </p>
        <p>
          OpenCL memory objects created from Direct3D 10 resources must be acquired before
          they can be used by any OpenCL commands queued to a command-queue. If an OpenCL
          memory object created from a Direct3D 10 resource is used while it is not currently
          acquired by OpenCL, the call attempting to use that OpenCL memory object will return
          <code class="constant">CL_D3D10_RESOURCE_NOT_ACQUIRED_KHR</code>.
        </p>
        <p>
          If <code class="constant">CL_CONTEXT_INTEROP_USER_SYNC</code> is not specified as CL_TRUE during
          context creation, <code class="function">clEnqueueAcquireD3D10ObjectsKHR</code> provides the
          synchronization guarantee that any Direct3D 10 calls involving the interop device(s) used
          in the OpenCL context made before <code class="function">clEnqueueAcquireD3D10ObjectsKHR</code>
          is called will complete executing before <code class="varname">event</code> reports
          completion and before the execution of any subsequent OpenCL work issued
          in <code class="varname">command_queue</code> begins. If the context was created with
          properties specifying <code class="constant">CL_CONTEXT_INTEROP_USER_SYNC</code> as
          <code class="constant">CL_TRUE</code>, the user is responsible for guaranteeing that any
          Direct3D 10 calls involving the interop device(s) used in the OpenCL context made
          before <code class="function">clEnqueueAcquireD3D10ObjectsKHR</code> is called have completed
          before calling <code class="function">clEnqueueAcquireD3D10ObjectsKHR</code>.
        </p>
        <p>
      General information about sharing memory objects with Direct3D 10 follows.
    </p>
        <p>
       The goal of this extension is to provide
      interoperability between OpenCL and Direct3D 10. This is designed to function
      analogously to the OpenGL interoperability. If this extension is supported
      by an implementation, the string "cl_khr_d3d10_sharing" will be present in the
      <code class="constant">CL_PLATFORM_EXTENSIONS</code> or <code class="constant">CL_DEVICE_EXTENSIONS</code>
      string described in the table of allowed values for <code class="varname">param_name</code> for
      <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>.
    </p>
        <p>
       As currently proposed, the interfaces for this
      extension would be provided in cl_d3d10.h.
    </p>
        <p>
       This section discusses OpenCL functions that allow
      applications to use Direct3D 10 resources as OpenCL memory objects. This allows efficient
      sharing of data between OpenCL and Direct3D 10. The OpenCL API may be used to execute
      kernels that read and/or write memory objects that are also Direct3D 10 resources. An
      OpenCL image object may be created from a Direct3D 10 texture resource. An OpenCL buffer
      object may be created from a Direct3D 10 buffer resource. OpenCL memory objects may be
      created from Direct3D 10 objects if and only if the OpenCL context has been created from
      a Direct3D 10 device.
    </p>
        <h4><a id="id-1.6.9"></a>Lifetime of Shared Objects</h4>
        <p>
       An OpenCL memory object created from a Direct3D
      10 resource remains valid as long as the corresponding Direct3D 10 resource has not been
      deleted. If the Direct3D 10 resource is deleted through the Direct3D 10 API, subsequent
      use of the OpenCL memory object will result in undefined behavior, including but not
      limited to possible OpenCL errors, data corruption, and program termination.
    </p>
        <p>
       The successful creation of a
      cl_context against a Direct3D 10 device specified via the context create parameter
      <code class="constant">CL_CONTEXT_D3D10_DEVICE_KHR</code> will increment the internal Direct3D
      reference count on the specified Direct3D 10 device. The internal Direct3D reference
      count on that Direct3D 10 device will be decremented when the OpenCL reference count on
      the returned OpenCL context drops to zero.
    </p>
        <p>
       The OpenCL context and corresponding command-queues
      are dependent on the existence of the Direct3D 10 device from which the OpenCL context
      was created. If the Direct3D 10 device is deleted through the Direct3D 10 API, subsequent
      use of the OpenCL context will result in undefined behavior, including but not limited
      to possible OpenCL errors, data corruption, and program termination.
    </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
          Returns <span class="errorname">CL_SUCCESS</span> returns <span class="errorname">CL_SUCCESS</span>
          if the function is executed successfully. If <code class="varname">num_objects</code> is 0 and
          <code class="varname">mem_objects</code> is NULL then the function does nothing and returns
          <span class="errorname">CL_SUCCESS</span>. Otherwise it returns one of the following errors:
        </p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">num_objects</code>
              is zero and <code class="varname">mem_objects</code> is not a NULL value or if
              <code class="varname">num_objects</code> &gt; 0 and <code class="varname">mem_objects</code> is NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> if memory objects in
              <code class="varname">mem_objects</code> are not valid OpenCL memory objects or if memory
              objects in <code class="varname">mem_objects</code> have not been created from Direct3D
              10 resources.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_COMMAND_QUEUE</span> if <code class="varname">command_queue</code>
              is not a valid command-queue.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if context associated with
              <code class="varname">command_queue</code> was not created from an Direct3D 10 context.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_D3D10_RESOURCE_ALREADY_ACQUIRED_KHR</span> if memory objects
              in <code class="varname">mem_objects</code> is not have previously been acquired using
              <code class="function">clEnqueueAcquireD3D10ObjectsKHR</code> but have not been released using
              <a class="citerefentry" href="clEnqueueReleaseD3D10ObjectsKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReleaseD3D10ObjectsKHR</span></span></a>.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT_WAIT_LIST</span>
              if <code class="varname">event_wait_list</code> is NULL and
              <code class="varname">num_event_in_wait_list</code> &gt; 0,
              or <code class="varname">event_wait_list</code> is  not NULL and
              <code class="varname">num_event_in_wait_list</code> is 0, or if event objects in
              <code class="varname">event_wait_list</code> are not valid events.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate
              resources required by the OpenCL implementation on the host.
            </li>
          </ul>
        </div>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p><img src="pdficon_small1.gif" />
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf#page=77" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="cl_khr_d3d10_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d10_sharing</span></span></a>,
            <a class="citerefentry" href="clGetDeviceIDsFromD3D10KHR.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceIDsFromD3D10KHR</span></span></a>,
            <a class="citerefentry" href="clCreateFromD3D10BufferKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromD3D10BufferKHR</span></span></a>,
            <a class="citerefentry" href="clCreateFromD3D10Texture2DKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromD3D10Texture2DKHR</span></span></a>,
            <a class="citerefentry" href="clCreateFromD3D10Texture3DKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromD3D10Texture3DKHR</span></span></a>,
            <a class="citerefentry" href="clEnqueueReleaseD3D10ObjectsKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReleaseD3D10ObjectsKHR</span></span></a>
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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